posted on Feb, 15 2012 @ 10:23 PM
reply to post by PapagiorgioCZ
Well, firstly.....your source was a blog written in Czech.
But more importantly, it was dated from way back in 2009. The two images appear to be the result of radar "noise" captured at those particular
moments, for the screen shots used in the Blog.
No, lightning usually does not occur in dry air....with a few exceptions. This is always associated with nearby thunderstorm activity, or at least a
cloud with a lot of vertical motion occurring in it....even if the lightning actually travels to a ground, for a strike, in an area that is not
currently receiving rainfall.
The air will generally have enough material in it to carry the electrical current....even a lot of dust can do this. So, moisture in the air, and
other particulates, can be conductors of electricity....as well as the ionization of the various gas molecules themselves, due to electrical imbalance
of the molecules' electrons ("static" electricity build-up).
Dry Lightning and Dry Microbursts
To tell the truth, the actual science of lightning, how it forms, is still undergoing a lot of research.
A great deal of all lightning that occurs does not even strike the ground.....there is also a lot of cloud-to-cloud activity, but such are not
detected and cataloged for later research.
The Wiki Article about all Lightning
has a lot of detail.